FULL PRODUCT VERSION :
java version "1.8.0_111"
Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Darwin acbc32c7fb93.ant.amazon.com 15.6.0 Darwin Kernel Version 15.6.0: Thu Sep  1 15:01:16 PDT 2016; root:xnu-3248.60.11~2/RELEASE_X86_64 x86_64

A DESCRIPTION OF THE PROBLEM :
Given a class like this:

public class MapAndList {
	public void test(Map<String, Object> map) {
	}

	public void test(List<Object> collection) {
	}
}

Nashorn fails to call the function "test" with an array:
e.g. instance.test([1,2,3]) will result in java.lang.NoSuchMethodException: Can't unambiguously select between fixed arity signatures [(java.util.Collection), (java.util.Map)] ...


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the following code:

public class MapAndList {
	public void test(Map<String, Object> map) {
	}

	public void test(List<Object> collection) {
	}
}

ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
engine.put("mapcoll", new MapAndCollection());
engine.eval("mapcoll.test([1,2,3]);");


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The call succeeds.
ACTUAL -
java.lang.RuntimeException: java.lang.NoSuchMethodException: Can't unambiguously select between fixed arity signatures [(java.util.Collection), (java.util.Map)] of the method NashornCollectionArityBugTest.MapAndCollection.test for argument types [jdk.nashorn.internal.objects.NativeArray]

ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.RuntimeException: java.lang.NoSuchMethodException: Can't unambiguously select between fixed arity signatures [(java.util.Collection), (java.util.Map)] of the method NashornCollectionArityBugTest.MapAndCollection.test for argument types [jdk.nashorn.internal.objects.NativeArray]
	at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:397)
	at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:446)
	at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:403)
	at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:399)
	at jdk.nashorn.api.scripting.NashornScriptEngine.eval(NashornScriptEngine.java:155)
	at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:264)
	at NashornCollectionArityBugTest.mapVsCollectionArityBug(NashornCollectionArityBugTest.java:54)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.lang.NoSuchMethodException: Can't unambiguously select between fixed arity signatures [(java.util.Collection), (java.util.Map)] of the method NashornCollectionArityBugTest.MapAndCollection.test for argument types [jdk.nashorn.internal.objects.NativeArray]
	at jdk.internal.dynalink.beans.OverloadedMethod.throwAmbiguousMethod(OverloadedMethod.java:225)
	at jdk.nashorn.internal.scripts.Script$1$\^eval\_.:program(<eval>:1)
	at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:637)
	at jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:494)
	at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:393)
	... 29 more



REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.util.Collection;
import java.util.List;
import java.util.Map;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

import org.junit.Test;

public class NashornCollectionArityBugTest {
	ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");

	@SuppressWarnings("unused")
	public class MapAndList {
		public void test(Map<String, Object> map) {
		}

		public void test(List<Object> collection) {
		}
	}

	@SuppressWarnings("unused")
	public class MapAndCollection {
		public void test(Map<String, Object> map) {
		}

		public void test(Collection<Object> collection) {
		}
	}

	@Test
	public void mapVsListArity() throws ScriptException {
		// Given I have a method that can take either a Map or a List
		engine.put("maplist", new MapAndList());

		// When I call the method with an NativeArray parameter
		engine.eval("maplist.test([1,2,3]);");

		// Then call should succeed
	}

	// As of Java(TM) SE build 1.8.0_111-b14 this will fail with:
	// java.lang.NoSuchMethodException: Can't unambiguously select between fixed arity signatures [(java.util.Collection), (java.util.Map)] of the method NashornCollectionArityBugTest.MapAndCollection.test for argument types [jdk.nashorn.internal.objects.NativeArray]

	@Test
	public void mapVsCollectionArityBug() throws ScriptException {
		// Given I have a method that can take either a Map or a Collection
		engine.put("mapcoll", new MapAndCollection());

		// When I call the method with an NativeArray parameter
		engine.eval("mapcoll.test([1,2,3]);");

		// Then call should succeed
	}

}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Can be worked around if can change the signature from Collection to a more restrictive List